Envelop letter-sheet.



B. L. BEHRENDT.

ENVELOP LETTER SHEET. APPLICATION FILED APR.29, I915.

Patented Jan. 9, 1917.

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barren T BARNIM L. BEI-IRENDT, or BROOKLYN, NEW YORK.

ENVELOP LETTER-SHEET.

Application filed April 29, 1915.

To cZZ whom it may concern Be it known that I, BARNIM L. BEi-IRENDT, a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Envelop LetterSl1eets, of which the following is a specification.

This invention relates to improvements in envelop letter sheets, and its objects are, first, to provide a sheet of ordinary writing paper, that can be used in a typewriting machine, or written upon by hand, and afterward folded into the shape ofan ordinary rectangular envelop.

A second object is to combine with such sheet a flap that can be turned into certain of the folds of the letter sheet and there secured without gum, mucilage, paste, sealing wax, thread or wire, in such manner as to hold the sheet in its folded condition, together with whatever inclosures that may have been inserted, in a secure manner, for mailing.

A third object is to make use of the usual r postage stamp as part of the securing means,

without interfering with its purpose in any way. And finally to do away with the eX- pense and trouble of a separate container or envelop entirely.

These and other objects, such as economical construction, neatness of appearance and general adaptability, are attained by the novel construction of the sheet hereafter described and shown in the accompanying drawing, forming part of this specification, and in which Figure 1 is a general plan view of an envelop letter sheet, cut and creased in accordance with the invention. Fig. 2 is a fragmental view, showing a modified form of opening in the sheet. Fig. 3 is a similar view showing another modification. Fig. l is a perspective view showing the sheet partly folded, ready to have the flap inserted. Fig. 5 is a sectional view, taken on line 5-5 of Fig. 4, and, Fig. 6 is a rear plan view of the sheet as folded and sealed for mailing.

In carrying out the invention, the paper is cut preferably into substantially rectangular blanks, except for the flap 10 which extends along the center portion of one side edge, its length being a little more than the half length of the full sheet, its profile tapering slightly toward its outer edge. Theline 11, upon which the flap is folded, registers with top and bottom of the blank,

Specification of Letterszratent.

Patented Jan. 9, 1917.

Serial No. 24,653.

the otherwise straight edge of the blank. Other lines 12 and 13, respectively near the extend from the intersection of the flap with the side edges, laterally across the sheet, which is further folded centrally from top to bottom by the line 14. These marks are intended to indicate the proper lines for folding and do not interfere with the smooth level appearance of the sheet; they form however, sections 15, 16, 17, l8, l9 and 20, the first two of which may be imprinted as ordinary letter headsand are folded down on line 12 over the sections 17 and 18, after which the bottom sections 19 and 20 are folded upward on line 13, their edges overlying the edges of the top sections. The folded sheet is then further folded along the vertical line 14, thus bringing the section 17 into position to be used for receiving the address inscription in the manner of a common envelop. The flap 10 is secured by being inserted between the folded end sections 15 and 19, and center section l7,the other central section 18 presenting a smooth unbroken surface.

In the side of the blank section 18, that is the margin opposite the flap, is a recess 21, which may be rectangular in outline as shown in Fig. 1, diamond shaped, as in Fig. 2, or circular as indicated in Fig. 3, but in any case the area of the opening is to be such that it can be completely covered with an ordinary postage stamp, as indicated by broken lines in Fig. 6.

The stamp 22 is moistened and applied over the recess or cut-out 21 in such manner as to adhere to the flap, at that time directly below, and also to the margin surrounding the recess, thereby holding the flap in place,

except'it be torn away, indicating that the letter has been tampered with. Thus in sealing the folded sheet there is less labor involved than in folding, inserting in an envelop, moistening and sealing its flap and then applying a postage stamp as usual.

In order to cause the stamp to adhere with unusual security a tool, having asharply corrugated face may be pressed upon the stamp causing minute perforations in its surface and embedding it in such manner that it is impossible to remove it by steaming or moisture without evidence of such treatment.

To open the folded sheet a paper cutter or the like is inserted at either end, as between the sections 19 and 20, below the sealed flap, and carried across in the usual way, separating the flap along the line 11 and allowing the sheet to be unfolded. Thus it will be seen that an inscription on the face of the sheet cannot be read while in a folded condition and also that inclosures can be made with as much safety as can be obtained by the use of an ordinary envelop, the expense of which is entirely saved. The address is written below the indentation, recess or cut out 21 in the customary place and in the usual manner, so that the envelop letter when ready for mailing presents no unusual appearance except that possibly the postage stamp be nearer the center.

Another very considerable advantage is that the sending or mailing station of the receiving post-office is always printed permanently direct over the address makingit a legal document admitted in every court,

' while an ordinary envelop is no proof as to the matter alleged to in it.

Obviously certain modifications can be made from the embodiment shown without departing from the scope of the claims hereto appended, as for instance, the. flap may have its line of demarcation partially sepahave been contained Copies of this patent may be obtained for as new and seek to secure by Letters P at ent is 1. A letter sheet comprising a substantially rectangular paper blank, a flap formed centrally on one end thereof and of lessthan half the full length of said blank, said blank containing an open recess in the margin 7 opposite to said flap.

2. A letter sheet comprising a substantially rectangular paper blank, a flap formed centrally on one edge thereof and of less than half the full length of said blank, said blank being folded both vertically and longitudinally and containing an open recess in the margin opposite to said flap, and a postage stamp adapted to engage with said flap through the mentioned recess and with the margin therearound when said blank is folded.

Signed at New York, in the county of New York and State of New York, this twenty-fourth day of April, A. D. 1915.

BARNIM BEHRENDT.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

